<template>
  <div>
    <!-- 工作日历, 年和月 -->
    <!-- 专门放两个select框 -->
    <div class="select-box">
      <!-- 选择年份 -->
      <el-select v-model="currentYear" size="small" style="width: 120px; margin-right: 10px" @change="handleChange">
        <!-- 年份取给定年份的, 前五年 + 后五年 -->
        <el-option v-for="item in yearList" :key="item" :label="item" :value="item" />
      </el-select>
      <!-- 选择月份 -->
      <el-select v-model="currentMonth" size="small" style="width: 120px;" @change="handleChange">
        <el-option v-for="item in 12" :key="item" :label="item" :value="item" />
      </el-select>
    </div>

    <!-- 真正的日历结构 -->
    <el-calendar v-model="currentDate">
      <!-- 具名插槽 可以通过这个坑 传递自己的结构用于渲染; 作用域插槽 -->
      <!-- data: { ... day: '2023-03-10' }   date: 标准时间格式 -->
      <template #dateCell="{data, date}">
        <div class="date-content">
          <span class="text">{{ formatDay(data.day) }}</span>
          <span v-if="isRest(date)" class="rest">休</span>
        <!-- <span>迟</span> -->
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
export default {
  props: {
    // 开始日期
    startDate: {
      type: Date,
      // 默认获取当前日期
      default: () => {
        return new Date()
      }
    }
  },
  data() {
    return {
      currentYear: null, // 当前年份
      currentMonth: null, // 当前月份
      currentDate: new Date()
      // yearList: [2021, 2022, 2023, 2024, 2025] // 要遍历的年的数组
    }
  },
  computed: {
    // yearList 一定是基于currentYear动态计算得到的!!!
    yearList() {
      // 1. 自己利用for 循环 实现 (数组长度11)
      // 2. ...
      return Array.from(new Array(11)).map((item, index) => index + this.currentYear - 5)
    }
  },
  watch: {
    currentDate(newVal) {
      // console.log(newVal)
      this.currentYear = newVal.getFullYear()
      this.currentMonth = newVal.getMonth() + 1
    }
  },
  created() {
    this.currentYear = this.startDate.getFullYear() // 得到当前年份
    this.currentMonth = this.startDate.getMonth() + 1 // 当前月份  从0开始
  },
  methods: {
    handleChange() {
      console.log(this.currentYear, this.currentMonth)
      this.currentDate = new Date(`${this.currentYear}-${this.currentMonth}-01`)
    },
    formatDay(str) {
      const temp = str.split('-')[2]
      return temp.startsWith('0') ? temp.slice(1) : temp
    },
    isRest(date) {
      return [0, 6].includes(date.getDay())
    }
  }
}
</script>

<style lang="scss" scoped>
.select-box {
  display: flex;
  justify-content: flex-end;
}

::v-deep .el-calendar-day {
  height:  auto;
 }
::v-deep .el-calendar-table__row td::v-deep .el-calendar-table tr td:first-child, ::v-deep .el-calendar-table__row td.prev{
  border: none;
 }
.date-content {
  height: 40px;
  text-align: center;
  line-height: 40px;
  font-size: 14px;
}
.date-content .rest {
  color: #fff;
  border-radius: 50%;
  background: rgb(250, 124, 77);
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
  font-size: 12px;
  margin-left: 10px;
}
.date-content .text{
  width: 20px;
  height: 20px;
  line-height: 20px;
 display: inline-block;

}
::v-deep .el-calendar-table td.is-selected .text{
   background: #409eff;
   color: #fff;
   border-radius: 50%;
 }
::v-deep .el-calendar__header {
   display: none
}
</style>
